The biggest issue is so many are not adjusted properly.
They may have been right at the factory which does not account for loading the vehicles & I doubt dealers check them anymore.
Adjusting the headlights was part of dealer prep back in the 70's.
Keep in mind that the old original genny never put out what a modern alternator does.
So if ya still have a genny it may be fine.
I have a modern alt on mine and can burn up glow plugs!! After it starts.....no more glow to clean it up.
Best to let it die out & start over.
Wow them be some bearings. I think the biggest I fit were about 2.5" x 8" in an old planer.
Them long straight ones I got might work on a bigger bearing.